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===Biochemical Barriers===
 
===Biochemical Barriers===
Where there are breaks in the skin that are open to the outside environment the body has an armoury of biochemical barrieres that can stop infection. These are:  
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Where there are breaks in the skin that are open to the outside environment the body has an armoury of biochemical barriers that can stop infection. These are:  
 
* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal
 
* '''Lactic and fatty acids''' in sweat and sebaceous secretions are directly bacteriocidal
 
* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms
 
* '''Enzymes''' e.g. lysozyme in saliva, sweat & tears and Gastric acid denature microorganisms
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